Hi There, I have had an HRV system for 5 years and have found it is by far, the best investment we have made for our home since we purchased it 12 years ago. Our house had such a condensation problem, particularly in the rooms that have aluminium joinery. I used to get a spa towel every morning to wipe the rainy windowsills, I'm not exaggerating when I say raining inside! This no longer happens. My heating system is gas ducted in the floor. since the HRV our gas bill has reduced by $200 in the winter months. I know it sounds ridiculous but our house is so dry and warm, it takes less time and a lower heat setting to make us warm. I always recommend HRV to people. Purchasing the HRV system was easy because we did weekly payments that made it affordable and I was saving in gas that I easily justified the spend. It sold its worth to me within 2 months. We get our filter changed every 2 years and HRV make it easy to pay. They let me know it's due and I credit their account weekly until I've paid the total cost and somebody comes to do the work. I could write a book really because the health benefits have been great too! Very Happy Consumer!!!